linux-kernel - [next, PATCH 5/6] usb: mtu3: reset gadget when VBUS

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Message-ID: <4def1d8ab49ab7733693c037c979ea89895856df.1527065109.git.chunfeng.yun@mediatek.com>
Date:   Wed, 23 May 2018 16:53:19 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [next, PATCH 5/6] usb: mtu3: reset gadget when VBUS_FALL interrupt arises

When VBUS_FALL interrupt arises, it means U3 device is disconnected
with host, so need reset status of gadget

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/mtu3/mtu3_core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index 279f9cd..eecfd06 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -668,8 +668,10 @@ static irqreturn_t mtu3_u3_ltssm_isr(struct mtu3 *mtu)
 	if (ltssm & (HOT_RST_INTR | WARM_RST_INTR))
 		mtu3_gadget_reset(mtu);
 
-	if (ltssm & VBUS_FALL_INTR)
+	if (ltssm & VBUS_FALL_INTR) {
 		mtu3_ss_func_set(mtu, false);
+		mtu3_gadget_reset(mtu);
+	}
 
 	if (ltssm & VBUS_RISE_INTR)
 		mtu3_ss_func_set(mtu, true);
-- 
1.9.1